Swat Combat War

CITY IS UNDER GREATE DANGER!!!
A group of gangsters enter our city and they killed innocent people here and there,they have to be taken down to protect those innocent people. Snipers from SWAT are sent to deal with those terrorists.It's a call of duty,they must be careful of these gangsters since they also own their own weapons and a small carelessness could result in a disaster.There's no turning back,only choice is to kill them all save endangered people and towns.Battles take place in several places,bathroom,street,building roof.
Now comes the time to test weather you are a good SWAT sniper or not,training turns into real battle,there's no such thing as mistake,you have to be 100% sure you can kill those gangsters.Fight,soldier!!